Radiometer measures very low powers down to 300 fW.

Press Release Summary:

Integrating photodiode sensor and 18 Hz chopper, Model RM9-PD measures power of very low level CW or quasi CW sources with response time of 3.6 sec. Sensor is calibrated over entire range of wavelengths, from 0.2–1.1 µm, rather than single wavelength. Featuring digitally synthesized lock-in amplifier that minimizes external noise, sensor can measure power levels from 300 fW to 300 nW. Output can be displayed on any standard Ophir meter or on PC or Android smartphone or tablet.

Original Press Release:

Ophir Photonics Announces Low Noise, High Sensitivity Radiometer for Measuring Very Low Powers Down to 300fW

San Francisco, CA – Ophir Photonics Group, a Newport Corporation company celebrating 40 years of excellence as the global leader in precision laser measurement equipment, today at SPIE Photonics West 2016 announced the RM9-PD Radiometer, a sensor for measuring the power of very low level CW or quasi CW sources. The RM9-PD integrates a photodiode sensor and an 18Hz chopper into an easy-to-use system that measures very low powers. The sensor is calibrated over the entire range of wavelengths, from 0.2µm to 1.1µm, not just a single wavelength. The sensor features a digitally synthesized lock-in amplifier that reduces external noise to a minimum; this allows the sensor to measure power levels from 300fW to 300nW. The output of the sensor can be displayed on any standard Ophir meter or on a PC or Android smartphone or tablet.

Designed for detecting very low power radiation, the RM9-PD Radiometer features an 8mm aperture and fast response time (3.6s with display).

To display measurements, the RM9-PD Radiometer can connect directly to any standard Ophir meter or PC interface. This means no additional power module is required, as is the case with traditional radiometers. The RM9-PD works with Ophir's StarLite, Nova II, and Vega smart displays, and Juno PC interface. The sensor also works with the StarViewer app that brings laser power/energy measurements to Android smartphones and tablets. The display is automatically configured and calibrated when plugged into one of the company's laser measurement heads.


The RM9-PD Radiometer is available now. OEM pricing is available on request.

RM9-PD product page:

About Ophir Photonics

With over 35 years of experience, Ophir Photonics, a Newport Corporation company, provides a complete line of instrumentation including power and energy meters, beam profilers, spectrum analyzers, and goniometric radiometers. Dedicated to continuous innovation in laser measurement, the company holds a number of patents, including the R&D 100 award-winning BeamTrack power/position/size meters; BeamWatch®, the industry's first non-contact, focus spot size and position monitor for lasers in material processing; and Spiricon's Ultracal, the baseline correction algorithm that helped establish the ISO 11146-3 standard for beam measurement accuracy. The Photon family of products includes NanoScan scanning-slit technology, which is capable of measuring beam size and position to sub-micron resolution. The company is ISO/IEC 17025:2005 accredited for calibration of laser measurement instruments. Their modular, customizable solutions serve manufacturing, medical, military, and research industries throughout the world. For more information, visit

Sales Inquiries,

For more information, contact:

Gary Wagner

General Manager

Ophir Photonics (U.S.)

3050 North 300 West

North Logan, UT 84341

Tel: 435-753-3729



© 2016. BeamGage, BeamWatch, and BeamMaker are registered trademarks and Pyrocam, BeamMic, BeamTrack, NanoScan, and Ultracal are trademarks of Ophir-Spiricon. All other trademarks are the registered property of their respective owners.

All Topics